package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

//@Order(-1)
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> paramsMap = request.getQueryParams();

        // 2.获取请求参数中的authorization参数
        String auth = paramsMap.getFirst("authorization");

        // 3.判断参数是否为admin
        if ("admin".equals(auth)) {
            // 4.如果参数为admin，放行
            return chain.filter(exchange);
        }
        // 5.如果参数不为admin，返回401
        // 设置响应状态码为401
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        return exchange.getResponse().setComplete();
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
